1121505 Sealing crankcase lower section (N51)

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IMPORTANT: Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminum screws/bolts exclusively.
Aluminum screws/bolts must be replaced each time they are released.
Aluminum screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminum screws/bolts are not magnetic.
Risk of damage!
Joining torque and angle of rotation must be observed without fail.

IMPORTANT: Changed procedure.
It is not necessary to remove the cylinder head and the crankshaft.

Necessary preliminary tasks:

Remove ENGINE .
Mount engine on assembly stand .
Remove CLUTCH (if fitted).
Remove left and right engine support arm See 2211110 REPLACING LEFT ENGINE SUPPORT ARM (N51/N52/N52K/N53) or 2211100 REPLACING RIGHT ENGINE SUPPORT ARM (N51/N52/N52K/N53)
Remove OIL SUMP .

Release screws (1).

Pull out oil pump intake pipe (2).

Tightening torque: 11 41 1AZ

Fig 1: Pulling Out Oil Pump Intake Pipe

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Release screws (1).

Tightening torque: 11 13 5AZ .

Installation:

Replace aluminum screws

Remove oil deflector (2).

Fig 2: Identifying Oil Deflector With Screws

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Secure oil pump sprocket with steel pin _ 6.0 mm (3) to oil pump.

IMPORTANT: Release central bolt (2) only together with steel pin 6.0 mm (3).
Do not remove sprocket.

Release central bolt (2).

Tightening torque: 11 41 4AZ .

Fig 3: Identifying Oil Pump Sprocket Steel Pin (6.0 mm) And Central Bolt

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Unfasten screws (2).

Tightening torque: 11 41 5AZ .

Installation:

Replace aluminum screws.

Fig 4: Identifying Aluminum Screws

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Remove screw plug (1) from crankcase at front.

NOTE: Replace gasket.

Fig 5: Identifying Crankcase Screws Plug

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Release screw (1) for oil pump triangular drive with special tool 11 8 640.

NOTE: It is not necessary to remove the triangular drive.

Fig 6: Identifying Oil Pump Screw

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Version 1:

Attention!

Observe different screw lengths.

Release screws (1).

Tightening torque 11 41 2AZ .

Installation:

Replace aluminum screws.

Fig 7: Identifying Screws

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Version 2:

Attention!

Observe different screw lengths.

Release oil pump screws (1).

Tightening torque: 11 41 2AZ .

Installation:

Replace aluminum screws.

Fig 8: Identifying Oil Pump Screws

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Detach sprocket (1) in direction of arrow.

NOTE: The chain tensioner pushes the timing chain (3) of the triangular drive upward.

Do not remove camshaft sprocket.

Remove oil pump (2) in direction of arrow.

Fig 9: Detaching Sprocket

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Installation:

Check spacer bushings (1) for secure seating and damage; replace if necessary.

Align twin surface (3) on oil pump (2) to sprocket wheel.

Install oil pump (2).

Fig 10: Identifying Spacer Bushings And Oil Pump

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NOTE: The special tool bore for the TDC position is located on the inlet side underneath the starter motor.
Rotate engine at central bolt and secure flywheel in position with special tool 11 0 300 MANDREL .

Fig 11: Rotating Engine At Central Bolt Using Special Tool (11 0 300)

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Secure flywheel with special tool (1) 11 9 260 and special tool (2) 11 9 266.

Tightening torque

NOTE: Make sure that the special tool (1) completely engages in the flywheel teeth (see arrow)

Fig 12: Installing Flywheel Using Special Tool (11 9 260)

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Automatic transmission

Release flywheel bolts (1).

Release special tool (2).

Remove flywheel (3).

Fig 13: Releasing Flywheel Bolts

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Manual gearbox

IMPORTANT: Position crankshaft at TDC.
Remove dual-mass flywheel.
Secure flywheel with special tool 11 9 260 HOLDER .
Remove VIBRATION DAMPER .
Release flywheel bolts with special tool 11 4 180 SCREWDRIVER INSERT /

Fig 14: Locating Flywheel Bolts

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Fig 15: Identifying Crankcase Bolts Line

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Release all crankcase bolts (1) along line (2).

Fig 16: Crankcase Bolts Tightening/Loosening Sequence

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Release crankcase bolts M10 in sequence 14 to 1.

Release crankcase lower section (1) from crankcase upper section (2) with suitable tool (3)

Remove crankcase lower section (1) upwards.

IMPORTANT: Do not rotate crankshaft without crankcase lower section (1) (risk of damage).

Fig 17: Releasing Crankcase Lower Section From Crankcase Upper Section Using Tool

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IMPORTANT: Timing chain is pre-tensioned.
Do not raise crankshaft.

Carefully remove radial shaft seal (1).

Catch escaping engine oil with a cloth (2).

Fig 18: Removing Radial Shaft Seal

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Carefully remove radial shaft seal (1) towards front.

Catch escaping engine oil with a cloth (2).

Fig 19: Catching Escaping Engine Oil With Cloth

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IMPORTANT: Protect crankcase against sealant residues with a cloth (1).

Fig 20: Identifying Cloth For Protect Crankcase

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Remove sealant residues (1) with special tool 11 4 470 TOOL .

Remove injector nozzles (2) for liquid sealing compound on left and right.

Installation:

Replace injector nozzles (2).

Clean all threads with compressed air.

Fig 21: Identifying Sealant Residues On Injector Nozzle

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Position crankcase lower section (1) on crankcase upper section.

Screw in all M10 crankcase bolts.

Joint all M10 crankcase bolts (1) 20 NM from inside outwards.

Fig 22: Identifying Crankcase Lower Section

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Identify all M10 crankcase bolts with a colored marking (1) for checking.

Fig 23: Identifying M10 Crankcase Bolt Colored Marking

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Fig 24: Crankcase Bolts Tightening/Loosening Sequence

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Secure crankcase bolts M10 in sequence 1 to 14 with special tool 00 9 120 .

Tightening torque: 11 11 1AZ .

Fig 25: Identifying Crankcase Bolts

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Insert all crankcase bolts (1).

IMPORTANT: Observe different lengths and sizes of the bolts.
Tightening torque: 11 11 2,3 AND 4AZ .

Tighten screw (1) for oil pump triangular drive with special tool 11 8 640.

NOTE: Replace screw.

Tightening torque: 11 41 3 AZ .

Fig 26: Identifying Oil Pump Screw

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Tighten screw plug on front of crankcase.

Tightening torque: 11 11 8 AZ .

Installation:

Replace sealing ring.

Fig 27: Identifying Screw Plug On Crankcase

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Prepare radial shaft seal (1) on special tool 11 8 220.

Fig 28: Identifying Radial Shaft Seal And Special Tool (11 8 220)

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Position radial shaft seal (1) with special tool 11 8 220 on the crankshaft.

Fig 29: Positioning Radial Shaft Seal On Crankshaft Using Special Tool (11 8 220)

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Brush radial shaft seal (1) over the special tool 11 8 220.

Move radial shaft seal (1) parallel up against the crankcase.

Fig 30: Moving Radial Shaft Seal

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Screw special tool 11 9 182 with screws (special tool 11 9 184) to crankshaft.

Fig 31: Identifying Special Tools (11 9 182 And 11 9 184)

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Installation:

Prepare special tool 11 9 181 for installation.

Connect special tool 11 9 185 onto special tool 11 8 181.

Fig 32: Connecting Special Tool (11 9 185) Onto Special Tool (11 8 181)

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Pull on radial shaft seal with special tool 11 9 181 and 11 9 185 in combination with special tool 11 9 183.

Fig 33: Pulling On Radial Shaft Seal Using Special Tool (11 9 181)

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Screw on radial shaft seal with special tool 11 9 183 to limit position.

Fig 34: Identifying Special Tool (11 9 183)

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Installation:

Clean sealing surface (1) and degrease thoroughly in area of housing partition.

Apply a light coat of oil to running surface (2) of radial seal.

NOTE: Graphic N42.

Fig 35: Locating Sealing Surface

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Push radial shaft seal (1) carefully in direction of arrow on the special tool 11 9 235.

Fig 36: Pushing Radial Shaft Seal On Special Tool (11 9 235)

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IMPORTANT: Special tool 11 9 235 can only be attached with
2 opposite bolts.
Determine hole pattern on special tool.

Screw special tool 11 9 235 with special tool 11 9 234 on crankshaft.

Fig 37: Identifying Special Tools (11 9 234 And 11 9 235)

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Align groove (2) of radial shaft seal (1) centered to the housing partition (3.

IMPORTANT: After installation, the grooves must be filled with sealing compound.

Fig 38: Aligning Radial Shaft Seal Groove Centered To Housing Partition

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Draw in radial seal with special tool 11 9 231 in conjunction with special tool 11 9 233 until flush.

Fig 39: Identifying Special Tools (11 9 231 And 11 9 233)

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Drive both injector nozzles (1) on left and right with special tool 11 9 360 MANDREL into crankcase up to stop.

Fig 40: Driving Nozzles Using Special Tool (11 9 360)

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After fitting both sealing rings, check both sealing ducts for clearance.

Blow compressed air (1) at max. 6 bar into injector nozzle (2).

Compressed air must emerge at both sealing rings on left and right from the outlet bores.

IMPORTANT: If the compressed air does not flow out of all ducts. the crankcase must again be taken apart and cleaned.

Fig 41: Identifying Blow Compressed Air Onto Injector Nozzle

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Installation:

Use PRIMER 1.3 AND LIQUID SEAL 1.4 .

Prepare liquid sealing compound (1) in special tool 11 4 370 DEVICE .

Injector nozzles for injecting sealing compound are not required.

Fig 42: Identifying Liquid Sealing Compound Of Injector Nozzles

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Slowly insert liquid sealing compound (1) with special tool 11 4 370 DEVICE in direction of arrow.

Liquid sealing compound must emerge at radial shaft seals at front and rear.

Fig 43: Inserting Liquid Gasket Using Special Tool 11 4 370

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Stop (seal off) escaping liquid gasket with primer 1.3.

Fig 44: Inserting Brush Into Grooves Using Loctite Primer

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Stop (seal off) escaping liquid gasket with primer 1.3.

Fig 45: Inserting Brush Into Groove

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Assemble engine.